Electric motor.



PATENTED APR. 23, 1907.

M; ,,M w m. i K We 2 ra mfi JOHN B. GURY, OF ST. LOUIS, MISSOURI.

ELECTRIC MOTOR.

Specification of Letters Patent.

Eatentecl April 23, 1907.

Application filed July 16,1906. Serial No- 326,388.

To all whmnjt may concern.-

Be it known that I, JOHN B. GURY, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Electric Motors, of which the following is a specification.

My invention relates to electric motors, and especially to alternating-current motors.

It has for its principal objects to provide a simply-constructed and easily-operated attachment for such motors, whereby the armature can be quickly brought up to speed before the current is applied; to provide means for creating a circulation of air within the motor-casing in order to cool the working parts, and to attain certain other advantages hereinafter more fully appearing.

The invention consists in the parts and in the arrangements and combinations of parts hereinafter'described and claimed.

' In the accompanying drawings, which form part of this specification, and wherein like symbols refer to like, parts wherever they occur, Figure 1 is an end View of'amotor with my startingattachment applied thereto, and

- Fig. 2 is a longitudinalisectionthrough the motor-casing withparts of the motor and starting attachment shown in elevation.

Themotor comprises a casing 1, having seats for the bearings 2 of the armature-shaft 3. The-outer end of the shaft 3 is reduced and has loosely mounted thereon a pinion 4.

I I The pinion is provided on one of its faces with ratchet-teeth, which are adapted to engage similar teeth on the portion 5 of said armature-shaft. A collar 6 is secured on the end of the armatureshaft and forms an abutment for a spring 7, which is adapted to yieldingly hold the pinion 4 with its ratchet-teeth in engagement with the teeth on the armatureshaft.

' Mounted to reciprocate in bearing-brackets 8 on the motor-frame is a slide-bar 9. This slide-bar 9 is provided at its upper end with an offset bracket or handle 10, having a knob portion 11 by which said slide-bar can be easily depressed. The bracket 11 is formed with a shoulder or projection 12,

which is adapted to engage a catch 13 ona spring-actuated lever 14 when the slide-bar is depressed, and whereby said slide-bar can be heldin its depressed position during the operation of the motor. The lever 14 is pivotally mounted between lugs 15 on the top of the motor-casing 1, and is provided with a able distance along the toothed edge.

finger-piece or button 16 on its end, whereby said lever can be easily moved against the action of a leaf spring 17,which bears against the under side thereof.

The slide-bar 9 is formed with a rack portion 18, the teeth of which are adapted to mesh with the teeth of the pinion 4. The slide-bar is cut away, as at 19, for a consider- T 1e depth of'the cut-out portion is suflicient to enable the slide-bar to clear thepinionwhen said slide-bar has been depressed a distance sufiicient to move its rack portion 18 beyond the pinion. Thus during the operation of the motor the pinion 4 runs free of the slidebar in the elongated cut-out space 19.

The lower end of the slide-bar 9 is bifurcated, as shown in Fig. 2, and has secured between the forks thereof an insulation-block 20. Secured to the insulation-block 20 is'a U-sha ed metallic contact-plate 21. This metal ic contact-plate 21 is adapted to engage a pair of spring-contacts 22 when the slide-bar reaches its lowermost position. The spring-contacts 22 are mounted on the lower bearing-bracket 8 and are insulated therefrom by insulation-blocks 23. spring-contacts 22 are connected with the wires 24 of the motor-circuit and are normally out of contact with each other, the circuit being thus normally broken. The circuit is closed when the contact-plate 21 engages and connects the spring-contacts 22. A spring 25, having one end fastened to a stud 26 on the motor-casing 1 and its opposite end secured to a stud 27 on the slide-bar 9, yieldingly supports said slide-bar in its raised or normalposition.

When it is'desired to startthe motor, the slide-bar 9 is quickly depressed and the toothed rack portion 18 engages and imparts a rotary motion to the pinion 4. This pinion in turn through its ratchet connection with the armature-shaft 3 rotates the armature. In practice the slide-bar is depressed until its portion 12 engages the catch .13 on the locking-lever14.- I

The length of the rack portion 18 is such that when the slide-bar reaches its lowermost position the rack is moved beyond and These spring-contacts 22 the motor is brought up to speed before the current is applied, which action is necessary with alternating-current motors.

When it is desired to stop the motor, the locking-lev'er14 is depressed to release the projection 12 from the catch 13. The spring 25 will then return the slide-bar to its normal position, thus breaking the motor-circuit. The spring 7, which yieldingly holds the pinion 4 in engagement with the armature-shaft, and the shape of the ratchet-teeth permits of the pinion being rotated on a reverse direction to the direction of rotation of the armature during the restoring of the slide-bar to its raised position.

By the construction herein set forth a simple and easily-operated device is provided for alternating-current motors which will quickly bring the motor up to speed before the current is applied.

The particular form of windings for the armature and field-magnets is not shown, as

the same does not constitute a part of this invention and may be of any well-known style. It is, however, preferable toprovide a plurality of wings or extensions 28 on the armature which are adapted to travel in an air-space 29 at each end of the motor-casing 1. The motor-casing is formed with two series of openings 30 in its curved wall and a series of openings 31 in each end wall, said openings communicating with the respective air-spaces'29. When the armature rotates rapidly, the wings 28 attached thereto will fan the air within the air-spaces 29, and thus cause eddies and acirculation therein, and the openings 30 and 31 permit of a circulation of outside air through said spaces.

Obviously my device admits of considerable modification within the scope of my invention, and therefore I do not wish to be limited to the details of construction shown and described.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A motor comprising a rotatable armature, a shaft for said armature,'a pinion on said armature-shaft having a ratchet connec-' tion therewith, a manually-operable slidebarhaving a toothed ratchet adapted to engage said pinion, whereby said armature is adapted to be rotated when said slide-bar is actuated in one direction, said slide-bar having a circuit-closer mounted thereon, terminal contacts located in the path of said circuit-closer and normally disconnected from each other in a normally open motor-circuit, said circuit-closer being adapted to engage and connect each of said terminal contacts to close the motor-circuit after said armature has started to rotate, means for engaging and locking said slide-bar in its forward position, a manually-operable device for releasing said locking means, and a spring for retracting said slide-bar.

2. A motor comprising a casing, a shaft rotatably mounted in said casing, an armature on said shaft, a pinion having a ratchet connection with said shaft, a manually-operable slide-bar mounted in bearing-brackets on said casing, and a spring arranged to restore said slide-bar to normal position, and means for locking said slide-bar in its actuated position, said slide-bar having a toothed rack portion adapted to engage and rotate said pinion when said slide-b ar is moved, a circuitcloser mounted on the end of said slide-bar, and terminal contacts located in the path of said circuit-closer and normally disconnected from each other in a normally open motorcircuit, said circuit-closer being adapted to engage and connect each of said terminal contacts to close the motor-circuit after the armature has started to rotate, thetoothed portion of said slide-bar being so arranged as to be disengaged from said pinion before the locking nieans'becomes operative.

3. A motor comprising a casing, a shaft rotatably mounted in said casing, an armature on said shaft, a pinion having a ratchet connection with said shaft, a slide-bar mounted in bearing-brackets on said casing, a toothed rack on said slide-bar adapted to engage and rotate said pinion when said slide-bar is actuated, a circuit-closer comprising a contactplate secured to an insulation-block mounted on the end of said slide-bar, a pair of spring- 'contacts located in the path of said circuitcloser, said contacts being normally disconnected from each other and constituting terminals in a normally broken motor-circuit, said circuit-closer being adapted to engage and connect said spring-contacts to close the motor-circuit after the armature has started to rotate, a handle for actuating said slidebar, a projection on said slide-bar, a catch mounted on said motor-casing and adapted to engage said projection to hold said slidebar in its actuated position, and a spring for yieldingly holding said slide-bar in normal position, and for returning said slide-bar to normal position when released after actuation.

St. Louis, Missouri, July 14, 1906.

JOHN B. GURY.

Witnesses:

G. A. PENNINGTON,

J. B. MEGOWN.

IIO 

